Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 365 · 40 questions

What you do (Yeast is alive): 1. Pour warm (not hot) water into the bottle — an adult checks it. 2. Add the yeast and the sugar and swirl gently. 3. Stretch the balloon over the bottle’s mouth. 4. Wait 30 minutes, measure the balloon, then pour the mixture away and wash up.

1. 1.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) warm water (d) a magnet
2. 2.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of water”? (a) we change it (b) we keep it the same (c) we measure it
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a battery cell (c) sugar (d) warm water
4. 4.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of sugar”? (a) we keep it the same (b) we measure it (c) we change it
5. 5.True or false: sunlight is something yeast needs. (a) True (b) False
6. 6.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) a small bottle (c) a balloon (d) dry yeast
7. 7.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
8. 8.True or false: vinegar is something yeast does not need. (a) False (b) True
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a comb (c) dry yeast (d) a balloon
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) turmeric powder (c) warm water (d) a battery cell
11. 11.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a tiny living fungus (d) a kind of salt
12. 12.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) False (b) True
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of yeast (b) size of the balloon (c) the water temperature (d) the amount of water
14. 14.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a battery cell (c) turmeric powder (d) a magnet
15. 15.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) boiling hot (d) warm, not hot
16. 16.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
17. 17.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
18. 18.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) carbon dioxide gas (d) air from outside
19. 19.🔍 Which is the odd one out? (a) vinegar (b) time (c) sunlight (d) salt
20. 20.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) the yeast is killed (c) it grows faster (d) it glows
21. 21.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it heavy (c) to colour it (d) to make it sweet
22. 22.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) it turns to bread (d) the balloon is bigger
23. 23.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) time (d) vinegar
24. 24.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it grows much faster (d) it bursts at once
25. 25.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
26. 26.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
27. 27.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) pour it down the sink (d) throw it at a wall
28. 28.🍞 Which of these is something yeast needs? (a) sugar (b) sunlight (c) vinegar (d) salt
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a comb (c) sugar (d) dry yeast
30. 30.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) a balloon (d) a paper clip
32. 32.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) warm water (b) salt (c) sunlight (d) a magnet
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the same bottles”? (a) we change it (b) we keep it the same (c) we measure it
36. 36.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
37. 37.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a battery cell (c) dry yeast (d) a magnet
38. 38.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) the water temperature (c) size of the balloon
39. 39.🍞 Which of these is something yeast does not need? (a) time (b) salt (c) warm water (d) sugar
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is the one thing we change? (a) the amount of water (b) the water temperature (c) the amount of sugar (d) the amount of yeast

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